Fermion condensation: a strange idea successfully explaining behavior of numerous objects in Nature

Strongly correlated Fermi systems are fundamental systems, lacking theoretical understanding. Ideas of quantum and thermal fluctuations at a quantum critical point (QCP) have been put forward and the non-Fermi liquid (NFL) behavior of these systems was attributed to fluctuations. But these ideas failed to describe other properties. Facts about heavy-fermion (HF) metals and two dimensional (2D) $^{3}$He demonstrate very high values of the quasiparticle effective mass$m^\ast $. Fermion condensation quantum phase transition preserving quasiparticles and related with unlimited growth of $m^\ast $is capable to describe strongly correlated systems. In that case$m^\ast $ becomes temperature, density, magnetic field etc. depended but the very concept of Landau quasiparticles remains untouched. We found that despite different microscopic nature of 2D $^{3}$He and HF metals, both exhibits the same NFL behavior at QCP. NFL behavior is universal and independent of the peculiarities of Fermi-system.